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9th Grade Substitution Worksheet — Level 3 — Practice Set 3 — Answers

Answer sheet with worked solutions for the 9th Grade algebraic expressions worksheet.

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Success TutoringWorksheetsAnswer sheet9th Grade · Mathematics · Algebraic Expressions

9th Grade Substitution Worksheet — Level 3 — Practice Set 3 — Answers

Replace the letter with the number, then calculate. Use parentheses for negative values.

1.Find the value of 4x − 1 when x = 8

Answer: 31

  1. 4 × 8 − 1
  2. = 32 − 1 = 31
2.If x = −4 and y = 3, find the value of 8x2 + 5y

Answer: 143

  1. 8 × (−4)² + 5 × (3)
  2. = 128 + 15 = 143
3.If x = 7 and y = −5, find the value of −4x2 − 6y

Answer: −166

  1. −4 × (7)² − 6 × (−5)
  2. = −196 + 30 = −166
4.If x = −6 and y = −3, find the value of −x2 + 9y

Answer: −63

  1. −1 × (−6)² + 9 × (−3)
  2. = −36 − 27 = −63
5.If x = −1 and y = 2, find the value of 2x2 + 8y

Answer: 18

  1. 2 × (−1)² + 8 × (2)
  2. = 2 + 16 = 18
6.Find the value of 6x when x = 7

Answer: 42

  1. 6 × 7 + 0
  2. = 42 + 0 = 42
7.Find the value of 7x − 9 when x = −6

Answer: −51

  1. 7 × (−6) − 9
  2. = −42 − 9 = −51
8.If x = −6 and y = 2, find the value of 7x2 − 3y

Answer: 246

  1. 7 × (−6)² − 3 × (2)
  2. = 252 − 6 = 246
9.If x = −6 and y = 5, find the value of −5x2 + 5y

Answer: −155

  1. −5 × (−6)² + 5 × (5)
  2. = −180 + 25 = −155
10.If x = 8 and y = 2, find the value of −2x2 + 9y

Answer: −110

  1. −2 × (8)² + 9 × (2)
  2. = −128 + 18 = −110
11.Find the value of 9x − 5 when x = 8

Answer: 67

  1. 9 × 8 − 5
  2. = 72 − 5 = 67
12.If x = −2 and y = −2, find the value of 5x2 + 6y

Answer: 8

  1. 5 × (−2)² + 6 × (−2)
  2. = 20 − 12 = 8
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